dra: fix alpha milestone

199f1a8 incorrectly bumped up the alpha milestone.

Author: pohly

keps/sig-node/3063-dynamic-resource-allocation/kep.yaml

@@ -28,7 +28,7 @@ latest-milestone: "v1.27"
 
 # The milestone at which this feature was, or is targeted to be, at each stage.
 milestone:
-  alpha: "v1.27"
+  alpha: "v1.26"
   beta: "v1.29"
   stable: "v1.31"